.mixin(...) { // it matches arguments from 0-n .mixin() { // it matches exactly 0 arguments .mixin(@x: 1) { // it matches arguments from 0-1 .mixin(@x: 1; ...) { // it matches arguments from 0-n .mixin(@x; ...) {
.mixin(@x; @rest...) { // after the variable @a, the @rest is bound to arguments // @arguments is bound to all arguments }